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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de150843d11f316215a0b7587b5c65c0c1cdddcd6a9d5e5bc92fd4946f81509c' 
  AND token = 'p2rHcF7qQMlcJU7AvhIWu/15LvLMOKSt8R/OrY5d8UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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