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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d92091f3c3b1ddf412741629c16235829e603d15575528aa3f90550b9dad1b' 
  AND token = 'JsX1w4g99DWQGKlRU2pPci6cU+2sy/QZbIddp+j92Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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