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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6236a61c8cd06b3a3e8808a3846da0dd787bb6338f98cdb25d40053287620e' 
  AND token = 'KgsCNRVOUJD/bPMepN/ccawGG1nDfMnbVZBojo1EPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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