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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c96a7e15df21aad0040435751a32a75023106a2cb225354310cdc0034a76f8a' 
  AND token = 'SdXFLbRAUy35iIEp63TSt+kfe58OvsnCK/6odH3OtdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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