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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da30204fae5a3775a249a261c503100264cdae8fafcde0e7aa9ffb79f809e25c' 
  AND token = 'baA43KzTwI5Wnfk4UVs35Se7k6gd3Vf8FL7wf5xN8Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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