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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8a4f6ad5b6b594a18b85d792c4718545e5f24c2c70a118b8a71b21c9106f02' 
  AND token = 'Vk0anPHknKwk9fOVojCHdr2We6Q70epo0rhjfGZHcA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}