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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bf8825a1fb1f0ab768b9f4cf7c7d53be8cbae3046ad163b3d330ab284187ee' 
  AND token = 'uzVIHvNf1+AHD6ZRkXxG+ybeDvNbCxukGbXBAsJ9nqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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