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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f8a202e33b4fac694ff1b9bfc958515249612f9faa6da007b0311e0cc100f6' 
  AND token = '9wlZM1qL/l92TYwJDaqA5mknpwfZ7e+09K/4agsq8Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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