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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459cc4ca06f6c193a0263db65454dab02c2a845a86a2dbf53b73ea56d5007893' 
  AND token = 'lIDvHc0cEDrCF6UYw7NJKlANiuUDm+IPzM4S41NM+LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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