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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbe1a137ea26b682ceb73384144f4d4db62b3fe21c435bc0f53cdc05cb22a86' 
  AND token = 'BXGUA8L65VgSiyYZdIpUyu69V9g483Ic2kRivkug5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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