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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792f288417a1cc819e78bdabee1304933375724501100415a32202e8f91d465c' 
  AND token = '+QqxQuQ/AAbPjtDqIhDmkTbYkxUMGHmYVtQfis8/45w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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