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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600bed55dd4a5d770bb49bf292efdb01575efdad54bafd1ea7e3935830d86371' 
  AND token = '/Z5Cp86URyR7yXIQxFachWJoTierypizQoVTlooaAkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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