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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96549c0768ecab155baf2d210fa9eca7e75c61aa36bccab9f4982b89a6dc2b7' 
  AND token = 'aWxZOLmLMDoJKWiYsbWsI1DO3748cLhLhqbVLN3/lhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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