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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76eddf3a4e1f456aeb1cbfd15579ba6bb2c226597bf4f39c7d7a6f56083bead' 
  AND token = '0eMWdWmsi8FQ7QuOHAoZp4L7RLY/pUu1ZR+tTHdZvtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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