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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f8a88cd2d512de799c96318aa89a0383c94a2a9ec8ad094f8d8c4d4ea29c54' 
  AND token = 'IzqXjyf8NkSYaYY07Lfxvcioc3l3d3vcgDFfWaxxuUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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