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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab6d9507f346056c46ff0b472f9b8d5d529daa5b7b734fd7ad424ec057fd917' 
  AND token = 'up9mvN6q0E0aoNUifwpOyxFy4RAIaIiGeQv94PVwP9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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