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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea3eae329743fb797ca00173634ba3a8301870b5faf8560d449dd1191d28146' 
  AND token = 'lbjejTERH/+UiNxRdh/W58PR0O15a6XRj4GOCUe35R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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