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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b31ee0a9fb65e5b1cca4f912c08adbb93517ae8b851d5280a788ae58762841' 
  AND token = 'X552oO46nfxyWWVw7ZYNDJqrdYCxy1vty86sAJF1L8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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