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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e776c8c742bf0ed3f56e973330b42421bcc76c7c3d543c413e0d898f95e34c3' 
  AND token = 'g5WDM2UGiZpYBKceG2Xzi/p/mDckf4TtRYH9DU8QyXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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