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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655366286237a38fb16b5e4c263cef706d708004fc23cfa3c359d8b093807805' 
  AND token = 'P8NbDLyCbNfBjIzdmFbjBFMRF02JiHd41A0pY18rcBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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