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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd50ab895cd754e989aa37f4b1a96f8e27237105d83e14291d9023c81a8c8955' 
  AND token = 'glGhS9yPLkB9ai2z8PL3Yd2qevipik6RUvSeO7ecKx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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