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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ff5027085ce78bbda1a491d81ddb4f2f6762a31706e67e41238906c94fa894' 
  AND token = 'muexjbivzW595pGkzfWOlTp9UNOPsTG11VSJmeJ1Bb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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