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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8359538b51d794af998f9afe2fe096f71f85b3f325e1ca9559e8fb532adf85f' 
  AND token = 'gnMYUs8PNl0OiIDZ5Fv6FJBRDLZpeNFuD7clwxVM6ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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