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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7effa86c2766c6ff499b538cb873944489df8ae3a2da3ce7b21087a792ffdf' 
  AND token = '5uxKs/0XFYkXp9akXV6VQTuuw3kQdncB3kQt7Ur62Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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