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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e1a19a958ce4319d07c4b7933ad0a68d08388d2ba29cba67ad36abbc54e3fe' 
  AND token = 'R3Wq3RXdfjh4CzAVowlqCS1iZBjdEIhjRM3RdckOM1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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