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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69fcdbf9f75201ff045ed4cc5d48ddc3176bdd9245dc6e32573db2ba3b3eaa3' 
  AND token = '0z44+COEsgWayN2E29OriPl7f1J7148YYLaE26oPOCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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