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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1169c85ea94622063a4fc649d89671f30c21cd9b40e165ea4aed5b470e91a98f' 
  AND token = 'MXWIlhrHUN2Pb+jRBuEUqX5NqqzwXXX1C6HUa5Tb3ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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