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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eff038cdfb7fc72177d430d42ecf7174bab83f283dc83a75e9a29ed2503c587' 
  AND token = 'zgu1iECeCQU9HntyQ61A2JrS/OJw1w2jGEw2xt/mbJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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