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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a548a36cf48484709c92d42bdc1ab7190f2ff372ce88b52764845fa877e1aac4' 
  AND token = '9Y0laF6lkHojAK8Wue2j0ayafvSIeGgnbeZOPqBXh2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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