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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd92f917a6e987091744e4d4449ef9555cd1dfca50887c00e1c8f1d67bf2b53' 
  AND token = 'FhPwWaNXrbAPmQrI8XcViYcQJIbn3+ySQj/r+GGHAEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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