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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10c9c96180c75e8704bea6158cc1d0174184fe86a53931fc16dda0a37bcc563' 
  AND token = 'cU5gCP4AJEM7UbUcPl5fXXZciNAGDSuyXssF4FPm3jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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