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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06af5bc6139bbcbe74a6a63894dd61f31ee6dbdf2815b03b82718c0ca9900fe1' 
  AND token = 'tRoAnJpkbgacD5g9k+YjZ07dGtR9huGBoERGOnXVgNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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