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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcacba2acd16955267efaaf8cab8b5c63036387558ea6d9ea21e3e8f5f4e753a' 
  AND token = 'JaZGI3Bs+D7RorsyqgCUg+I8TT8ZWPtDXDzy8vLiZ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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