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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decdb34937c8f4db952c1debb92bd7dddef4c344c481f7ebcaab19580e4e64a3' 
  AND token = 'vwzEnjJqRVZBQ37shYYdXzWdcGu9uZN9hYvyc2dDIDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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