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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcdae9f5f65699d94f6ce2f26f18b3f91a00271a6942ef188630881d3bd33ae' 
  AND token = 'tHBYDBgMQmS9ArkLb3oddoN3nHA209tbfuoaSakfhW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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