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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3524ce9315f36c28395d10eb0c1c48352ba2a326cd73833a4db80f88dac84353' 
  AND token = 'i2sZhyRK+CvkaU8uI9iYmaxD/evw2V6Zbsidw1KZPbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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