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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94db29b1b131ba4c49011bfe16107afe3d20323cef08499f0e8c3c7d4624ddb' 
  AND token = 'Cfsy6nMlTpDHGtKgd4B8/zF9E4LslsP8J7454NRWpWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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