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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d0f053b357fbe226745a6f12b0cf864062237a54e7c3af551a53ee04f46dc7' 
  AND token = 'Au0iaVdryBHMAPsxMxRypJPMvZojv09A7P/lrzg/T6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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