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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a474c597e304560a6554c434d81ddb4345cd701a379c5c76e2d8e7f24dfc16b' 
  AND token = 'YknuJFPPHE42AnxvcNbSARybSavzykz9r7vihQJoYeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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