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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb6140e32f98d1a241e522bfaf51c43bdcec8a10e2cd72ae02f34f06d2a641c' 
  AND token = 'bSkV3fCItuFztN/xAy/QOadJxmFXiI+fPb7AGwYuGUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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