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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b6a78de0a407a4b1eab93544fb6eb6f1afc01f0ed6469676248c080dbf821' 
  AND token = 'U0wv/SPwYXGNORqThInNnGxL4Bi5tP73pTuWcisraI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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