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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9f5ee48d85591dce5efd5783c7bfe6fbadb17c2978dbc44dd696df8c8ccb0' 
  AND token = '0uKBE8Tar5XnCaxzhIz2y6eA8/YwvF9NVWeeqGq7KDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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