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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d030ce04eae6457e6a7bbcaa5415753ca59a5d5569cf487e7d9cc167e2159d' 
  AND token = '1pbAG3FgY90DLz2HVEENZoiEN4YebZvB6VwNY+PYuQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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