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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f029cdd3c53c351bea5d804eeb68a9e5ccd6c05b1ba1c2f10f6afe768d72fd2' 
  AND token = 'iAZjdf4pyH7dChl5drTqpd/EGt7GLqgZ5Pr+XhdL0qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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