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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a8be81da54450204472e1c1b3196db00ec7b054b7f2b7f4e0d21768ad718e6' 
  AND token = '3nYSMAcXmEzIRpvgBs1nGn7XkbO0xCowv3mop1zUrVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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