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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbabff67af98b7d7bb157c3f876d52ea5db7860e5c26737c36477d664a52bbbe' 
  AND token = 's2fmf2O9ru9tXZevf0EsWm0psdQhsOReIg+dl8DsRPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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