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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddf9ed9741ed9cd4eaa1a610188b95b796465b6501541b420249bc8cb9b694a' 
  AND token = 'O6nJ4bBgGH3LUgbK32OvPkHu5h1HCorqpOPz8Q20N6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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