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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bc4d17f622a5f0a2e2ebe8e94842d543ff6bdad0262a410aab4f28cbf87056' 
  AND token = 'FcwGQ1o2hhnA1wEYaigxEZaNhtDf8JyuO06p3w1Z0og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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