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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736f9eefc3ea894e36fb16e513f0b3ebc009f7a23197be36b328053bf2ef6104' 
  AND token = 'ArAkQ3i3byVITYUMrHkRmR55ISkuh2hTJGObGs/pKVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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